CN101907177A - Exquisite soft sealed ball valve - Google Patents

Abstract

The invention relates to an exquisite soft sealed ball valve which is composed of a valve body, a valve seat and a ball body, wherein the valve seat is arranged in an annular groove of the valve body, a rear end surface of the valve seat is attached to the bottom plane of the groove to form a small end-surface axial seal structure, and outer diameter of the valve seat is slightly less than inner diameter of the groove to form clearance fit; the valve seat is provided with a first contact point before being compressed, an included angle a formed by a connecting line between the contact point and a central point of the ball body and parallel lines of a ball valve channel is a sealed contact angle of the ball body, and an included angle b formed by a conical surface line and an end surface line of the valve seat is a sealed contact angle of the valve seat; and the rear end surface of the valve seat is a second conical oblique plane, and the second conical oblique plane and the bottom plane of the annular groove of the valve body form a space of buffer and concession as well as a static sealing structure of a small end-surface. The exquisite soft sealed ball valve of the invention has effectively reduced torque, long service life, lowered cost and reduced waste of raw materials; and meanwhile the valve seat can be interchanged, conveniently assembled and disassembled and reused for a plurality of times.

Description

Exquisite soft sealed ball valve

Technical field

The present invention relates to a kind of energy-saving valve of wideling popularize, more specifically relate to a kind of Exquisite soft sealed ball valve saying, be mainly used in various pipes engineering field.

Background technique

The soft sealing ball valve of Sheng Chaning in the market, the valve torque problem all fails to obtain solution preferably, how the stability of control torque.A lot of factories one are the sealings of dispatching from the factory by all means often, no matter moment of torsion, moment of torsion is big, as long as and can operate movingly, just no matter it has much moments of torsion, influence the life-span with regard to causing the wearing and tearing of accelerating valve seat like this, the 2nd, valve seat can not exchange, but by singly joining, when occurring leaking and moment of torsion just adopts the car valve body when bigger than normal, valve gap or valve seat reach requirement, consequently when needing the valve seat accessory, the user just can't meet the demands, and product testing will repeatedly could be qualified, repair again, thus increased the cost of product, the 3rd, when moment of torsion is big, when manually becoming pneumatic operation, the pneumatic actuator band is motionless, will strengthen one-level gas final controlling element like this, cause a kind of product may join two kinds of pneumatic actuators, also increased cost.The 4th, valve seat can not be reused, and just can not re-use after valve seat is through a dismounting.The 5th, sealed width is excessive, causes moment of torsion bigger than normal, and it is big that spheroid becomes, it is big that valve body becomes, and the weight of valve increases, waste of raw materials, the 6th, a lot of factories reduce the cost of raw material by reducing the valve body wall thickness, and this way with sacrifice valve strength character is worthless, also is unscientific method.

Summary of the invention

The invention provides a kind of Exquisite soft sealed ball valve, this ball valve not only reduces the operation moment of torsion of spheroid, improve the life-span of product, also under the situation that does not reduce latus rectum size and valve body standard wall thickness, the raw-material waste of reduction that can be bigger, valve seat is reusable, has reduced cost of production widely.

For solving above technical problem and economic problems, the technological scheme that the present invention takes: a kind of Exquisite soft sealed ball valve, constitute by valve body, valve seat and spheroid, described valve seat is located in the annular groove of valve body, and the bottom plane of end face and groove fits and forms small end face axial seal structure thereafter, and the external diameter of valve seat is slightly less than the internal diameter formation Spielpassung of groove, changed former structure by radial seal, valve seat can be exchanged, be convenient to loading and unloading, also reusable.Described valve seat awl inclined-plane and spheroid cambered surface contact, an at first point of contact before not compressing, valve seat is arranged, the line of described point of contact and ball centre point, and with the formed angle a of the parallel lines of the ball valve passage sealing wrapping angle that is spheroid, the sealing wrapping angle that the formed angle b of described valve seat conical surface line and end face line is a valve seat, if point of contact is on mid point, the sealing wrapping angle of the sealing wrapping angle of spheroid and valve seat equates so.

Described valve seat ear end face adopts the second awl inclined-plane, form the space of a silk ribbon attached to an official seal or a medal between described second awl inclined-plane and the groove bottom plane towards space and yielding, the certain deformation space is arranged in the time of can making valve seat and spheroid pressurized and can play certain buffer function, valve seat Yin Wendu is raise certain yielding space when expanding, the lifting surface area that has the cone angle face can also reduce ear end face simultaneously plays the seal pressure that increases the bottom, can realize sealing easily by the area of small end face, so also reduced the impacting force of spheroid effectively, reduced the wearing and tearing of the moment of torsion and the valve seat of spheroid valve seat.

Owing to have said structure, this Exquisite soft sealed ball valve can effectively reduce moment of torsion, increases the service life, and also reduces cost, and reduces waste of raw materials, and valve seat can exchange simultaneously, is convenient to loading and unloading, and is also repeatedly reusable.

Description of drawings

Below in conjunction with accompanying drawing the present invention is further described in detail.

Fig. 1 is embodiment of the invention valve seat minimum sealing contact width and the Spielpassung of valve seat cylindrical and valve body inner bore and partial parsing figure of small end face axial seal after the spheroid compression.

Fig. 2 is the at first point of contact of spheroid and valve seat and the partial parsing figure of sealing wrapping angle for the embodiment of the invention.

Embodiment

As shown in Figure 1 and Figure 2, a kind of Exquisite soft sealed ball valve of the present invention, constitute by valve body 1, valve seat 2 and spheroid 3, described valve seat 2 is located in the annular groove 11 of valve body 1, and the bottom plane of end face and groove 11 fits and forms small end face 23 axial seal structures thereafter, and the external diameter of valve seat 2 is slightly less than the cooperation in the internal diameter formation gap of groove 11, changed former structure by radial seal, valve seat 2 can be exchanged, be convenient to loading and unloading, also reusable.Described valve seat 2 front-end faces contact with spheroid 3 cambered surfaces for the awl inclined-plane, before valve seat 2 does not compress, an at first point of contact is arranged, the line of described point of contact 21 and spheroid 3 central points, and with the formed angle a of the parallel lines of spheroid 3 passages be ball seal wrapping angle 31, described valve seat 2 conical surface lines and the formed angle b of end face line are valve base sealing wrapping angle 25, when having only a angle to equal the b angle, at first Jie Chu point is only real mid point.Described valve seat 2 ear end faces are provided with and adopt the second awl inclined-plane 24, form a silk ribbon attached to an official seal or a medal between described second awl inclined-plane 24 and groove 11 bottom planes and dash and make a concession the space, the certain deformation space is arranged in the time of can making valve seat 2 with spheroid 3 pressurizeds and can play certain buffer function, certain yielding space when being expanded because of temperature raises, valve seat 2 is arranged, the lifting surface area that has the second cone angle face 24 can also reduce ear end face 23 simultaneously plays the seal pressure that increases the bottom, can realize sealing easily by the area of small end face 23, so also reduce the impacting force of 3 pairs of valve seats 2 of spheroid effectively, reduced the wearing and tearing of the moment of torsion and the valve seat 2 of spheroid 3.

When at first ball seal wrapping angle 31 equaled valve base sealing wrapping angle 25, spheroid 3 and valve seat 2 at first point of contact 21 were only real sealing mid point.When if ball seal wrapping angle 31 is not equal to valve base sealing wrapping angle 25, the at first point of contact 21 of spheroid 3 and valve seat 2 is not just on mid point, if the plastic deformation that sealing point of contact 21 all can produce valve seat 2 transition at the place, big footpath and the path place of valve seat 2 cone angles, make intrinsic sealed width become big, thereby make moment of torsion become big.Has only sealing point of contact 21 when valve seat 2 inclined-plane mid points at first contact, just can make valve seat 2 produce uniform micro-strain, the awl inclined-plane of valve seat 2 and the arc surface of spheroid 3 are matched, also the ball valve that only at first contacts at mid point adds the relative seal compression rate that adopts, moment of torsion will reduce, it is also smaller to wear and tear, and working life is really elongated.The sealed width of described valve seat 2 directly affects the size of specific pressure, sealed width is subjected to the influence of three factors: the one, and pressure, the 2nd, latus rectum, the 3rd, the specific pressure allowable of valve seat 2 materials, the problem of the minimum sealed width 22 of ball valve is here at first proposed, minimum sealed width 22 is exactly the sealed width that satisfies under the valve seat 2 materials specific pressure condition allowable, and the specific pressure of minimum sealed width 22 is much larger than necessary specific pressure, and natural sealability is better.The 2nd, after minimum sealed width 22 diminished, the footpath had also diminished in the sealing, and spheroid has diminished, and valve body also diminishes, and entire product weight has also lightened like this, and moment of torsion has really reduced, and has also saved raw material in a large number.

Claims (2)

1. Exquisite soft sealed ball valve, it is characterized in that: by valve body, valve seat and spheroid constitute, described valve seat is located in the annular groove of valve body, described valve seat front-end face contacts with the spheroid cambered surface for the awl inclined-plane, an at first point of contact before not compressing, valve seat is arranged, the line of this point and ball centre point and the formed angle a of the parallel lines of spheroid passage are the ball seal wrapping angle, the formed angle b of described valve seat conical surface line and end face line is the valve base sealing wrapping angle, when having only a angle to equal the b angle, at first Jie Chu point is only real mid point, valve seat is after the spheroid compression, valve seat begins to be out of shape until the inclined-plane line from mid point and becomes the movable sealing structure that cambered surface line and spheroid fit and form minimum sealed width, and the external diameter of valve seat forms Spielpassung less than the internal diameter of groove.

2. ask 1 described Exquisite soft sealed ball valve according to right, it is characterized in that: described valve seat ear end face adopts the second awl inclined-plane, the bottom plane of described second awl inclined-plane and valve body annular groove forms the space that a silk ribbon attached to an official seal or a medal dashes and makes a concession, and forms the static seal structure of small end face.

Images